Method of



(ModeL) W. F. PEEK; METHOD OF AY'PPLYING IMPERVIOUS COATINGS TO METALLIC SURFACE S. No. 273,384. Patented 1V[a,1".6,18 83.

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Q N. PETERS. Phuloumogmphsr. Wlfllillglun. D. C.

NITED STATES WILLIAM F. PEEK, on BROOKLYN,- NEW YORK.

-METHOD OF APPLYING IMPERVIOUS COATINGS TO METALLIC SURFACES.

SPECIFICATION forming part of Letters Patent No. 273,384, dated March 6, 1883.

Application filed Mayl, 1882. (ModeL) To all whom z't may concern Be it known that I, WILLIAM F. PEEK, re-, siding in the city of Brooklyn and State of New York, a citizen of the United States, have invented a new and useful improvement in the method of applying impervious coatings to metallic surfaces, more particularly to the inner surfaces of metallic oil-cans or packages;

and I do hereby declare the following specifim cation to be 'a full, clear, and accurate description of the same, reference being had to the accompanying drawing.

In the use of metallic vessels for holding or carrying oils or fluids highly charged with gas 1 5 or volatile in character, the gas penetrates the pores of the metal exposed to its contact,rapidly corroding or oxidizing the surfaces, im-

pairing the strength and efficiency of the metal, frequentlyperforating and opening the seams or joints of the vessel, causing it to leak; and attempts have been, made to obviate these dit ages, but which have hitherto failed to meet the required purpose, because of the inability of making them adhere to metallic surfaces when applied in the same manner as to wooden packages; and the object of my invention is 0 to overcome this difficulty by the employment of such means and process as will make impervious substances (capable of resisting the action of carbonaceous oils, acids, and gases) permanently adhere to metallic surfaces to which they may be applied; and my invention consists in the application of an acid bath to metallic surfaces as a means for making impervious substances adhere when applied to them.

In the prosecution of my invention I proceed as follows: First, I thoroughly wet and saturate the metallic surfaces to be coated with a strong solution of acid, preferably muriatic acid, and while in that condition slush or cover such surfaces with a coating of glue dissolved in hot water of about the consistencyof cream, and allow it to thoroughly dry; and, second,

apply to the metallic surfaces prepared in the manner above described one or more coatings of any compound ofimpervious materials (that 0 will resist the action of carbonaceous oils, gases, or acids, or alkalies) at a temperature of about 80 Fahrenheit, of any required thickness, but preferably about one thirty-second part ofan inch thick, and allow it to thoroughly set or dry; third, under the hereinbefore-described process any one of the several wellknown impervious compounds used for coating the surfaces of wooden packages may be usedv on metallic surfaces; but preferably I use a compound made as follows: Combine in proportions five pounds of glue with one pound of glycerine by placing them together in a vesher as X, and upon which, in addition, a coating of impervious materials, compounded as hereinbefore described, has been applied; and

D represents a surface prepared in like manner as X, and having-a coating, B, of an impervious compound same asB, and, in addition,

between it and the prepared metallic surface a lining of muslin, U, and also a'lining' of paper, D. The linings of muslin and paper are sometimes desirable to cover joints or seams, in order to secure a more efficient result in avoiding abrasion of the impervious coating resulting from expansion or contraction.

I am aware that liquid preparations of glue, glycerine, and other materials combined have been used as impervious compounds for coating wooden packages, and that several of such compounds described in Letters Patent of the United States issued to A. I). Campbell, No. 31,051, July 7, 1862; D. H. Titus, No. 37,018, November 25, 1862, and D. F. Bowker, No. 185,483, dated December 19, 1876, and No. 228,028, dated May 25, 1880, and also others, describe as a part of such compounds the use of small proportionate quantities of acids under claims that broadly cover the application of such compounds to metallic vessels as well as woodenpackages; but I am not'aware'of any one ever having described or claimed the acid bath applied to metallic surfaces as a part of a process by which impervious compounds of the character described can be made to permanently adhere. The same quantity of acid required as a bath for wetting metallic surfaces, if combined with the ingredients constituting the compound, would entirely destroy its life or elasticity and its efficiency. Therefore in this respect the process radically differs, and the distinction between the process claimed under this application and those described under the several Letters Patent referred to is that, while under those patents small proportionate quantities of acids were used as a valuable agent in thoroughly uniting the several elements constituting the compounds, in none of these cases did it perform the special function of setting or making firmly adhere the compound. when applied to a metallic surface, which special function is the distinguishing feature of the invention claimed under this application. All of the impervious compounds referred to,

when applied to metallic surfaces by the process described under said patents, either produce an oxidation that impairs the efficiency of the compound, or (as when applied to tin) the compound will blister, dry loose, or scale 011', instead of settingor firmly adhering, which can only be effectively secured by aid of the acid bath I therefore claim as my invention- The process or method of preparing metallic surfaces by wetting with acid and then slushing or covering the same with a coating of thin glue or other adhesive substance, so that when dry it will form a holding-surface, the object of which is to bind or make adhere any coating of impervious compound subsequently applied, substantially as described.

WILLIAM F. PEEK.

Witnesses:

J. GEO. FLAMMER, WILLIAM LINDSAY. 

